91766665 has 16 divisors (see below), whose sum is σ = 118619136. Its totient is φ = 67953600.

The previous prime is 91766659. The next prime is 91766669. The reversal of 91766665 is 56666719.

It is not a de Polignac number, because 91766665 - 2⁷ = 91766537 is a prime.

It is a super-2 number, since 2×91766665² = 16842241610444450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91766669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9306 + ... + 16435.

It is an arithmetic number, because the mean of its divisors is an integer number (7413696).

Almost surely, 2^91766665 is an apocalyptic number.

It is an amenable number.

91766665 is a deficient number, since it is larger than the sum of its proper divisors (26852471).

91766665 is a wasteful number, since it uses less digits than its factorization.

91766665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25800.

The product of its digits is 408240, while the sum is 46.

The square root of 91766665 is about 9579.4918967553. The cubic root of 91766665 is about 451.0537691361.

The spelling of 91766665 in words is "ninety-one million, seven hundred sixty-six thousand, six hundred sixty-five".